6. Which optical phenomenon is responsible for the twinkling of stars?
A. Atmospheric reflection B. Atmospheric refraction C. Dispersion
D. Scattering
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Answer:
(b) atmospheric refraction.
Explanation:
The twinkling of a star is due to atmospheric refraction of starlight. The starlight, on entering the earth's atmosphere, undergoes refraction continuously before it reaches the earth. The atmospheric refraction occurs in a medium of gradually changing refractive index.
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